A soft steel wire brush should get rid of the bulk of the corrosion, and you can use a bit of scotchbrite to clean the mating surfaces before bolting the starter on. If you were picky you could inspect the carbon brushes when you remove the starter to make sure there's plenty of material left on them. It would also do no harm to clean the commutator with some fine sandpaper whilst you're in there.
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1996 850 T5 - Sold
2003 S40 1.9d - Sold
2004 S60 D5
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